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| Canon Patent for 18-70mm f/2.8-6.0 lens |
Egami, our Photography Blog friends in Japan has discovered another new Canon patent pending for an integrated 18-70mm f/2.8-6.0 lens corresponding to the image element in the APS-C equivalent of 1.6 times, and it seems to be an optical design that is suitable for an integrated digital camera lens, perhaps for a newer version of the PowerShot G1X in the future. You can read the translated article here on their Blog.
Self-interpretation and summary, Patent Documents
Patent Publication No. 2012-247758
- Release Date 2012.12.13
- Filing date 2011.5.31
Example 1
- Zoom ratio 3.80
- 35.12 - - 69.05mm f = 18.17 focal length
- Fno 2.89 -. 4.58 - 5.94
- Half angle of view ω = 33.37 - 20.87 - 11.14 °
- 13.39 - - 13.60mm 11.97 image height
- 89.56 - - 110.05mm 86.88 overall length of the lens
- BF 0.36mm
- 11 pictures in 9 groups lens configuration
- 5 three aspherical surface
- 4-group zoom positive negative positive
- Rear Focus (Group 4)
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